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You and your biology lab class take a field trip to a marine aquarium. Your guide is a marine biologist who studies squids. She explains to your class how squids are able to blend into their environment. She points out that squids have pouches of pigments embedded in their epithelium. The pouches are called

The waste in mollusks is removed by

What do echinoderms and chordates have in common?

The characteristic that enables efficient gas exchange in capillaries is:

Which of the following organs of cephalopods resemble those of the vertebrates?

A marine biologist visits your biology class and begins his talk entitled, “Life as a Trochophore.” A friend seated next to you asks, “What is a trochophore?” You explain that a trochophore is

When referring to an animal’s body, the dorsal surface is the __________________.

Animals can be divided into two main groups, the deuterostomes and the protostomes. Describe 3 key differences that distinguish protostomes from deuterostomes.

A true coelom (body cavity) is completely lined with:

Bony fishes possess two features not found in other fish. Select the best choice from those listed below to complete the following sentence. Bony fishes have